Each new gen or gen x.5 has included a pair of games where there's an option to return to the region of the previous gen. The first time Gamefreak did that was with GSC, and it was totally a surprise.

"Dude, do you know what you've just done??"

wat

"You've stepped foot into Kanto."

WTF is Kanto?

"Check your map!"

HOLY CRACK!

RBY's region didn't have a name back then. It was just "The Pokemon World" or maybe some thought it was Japan because of the IRL references like the moon landing and "Lightning American" Lt. Surge fighting in the Gulf War.

...

Also, it just suddenly hit me, but the manga Kumo desu ga, nani ka? that I've been enjoying lately is basically Pokemon without trainers. I guess that's why I'm so fond of it.